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Urea Nitrogen (BUN), serum
Test CodeBUN
Preferred Specimen
Serum, 0.5 mL minimum
Transport Container
SST tube
Transport Temperature
Unspun specimen stable for 2 hours at room temp., separated serum stable for 4 days if refrigerated
Reference Range
See report for normal ranges. Critical Values: >100 mg/dl
Clinical Significance
Urea is the major nitrogen-containing metabolic product of protein catabolism in humans, composing over 75% of the nonprotein nitrogen eventually excreted.The BUN test is primarily used, along with the creatinine test, to evaluate kidney function in a wide range of circumstances, to help diagnose kidney disease, and to monitor patients with acute or chronic kidney dysfunction or failure.